The choices are not given so it is best to discuss what is a facilitated diffusion. It is a type of diffusion where it involves a spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins. It is a process that requires the supply of added energy.
Usually, puberty starts between ages 8 and 13 in girls and ages 9 and 15 in boys.
Answer:
A) repressors
Explanation:
A transcription factor is a protein that controls the rate of transcription of genetic information from DNA to messenger RNA, by binding to specific DNA sequence. The function of TFs is to regulate-turn on and off genes-In order to make sure that they are expressed in the right cell, at the right time and in the right amount throughout the life of the cell and the organism. Groups of TFs function in a coordinated fashion to direct cell division, cell growth and cell death throughout life.
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